Signals of an Argentine submarine, that went missing with 44 crew on board, have been detected. The Defence Ministry is now trying to trace the location of the seven failed satellite calls received on Saturday.
Argentina has stepped up the search in the South Atlantic for the ARA San Juan submarine, with a Nasa research plane joining in. The diesel-electric vessel disappeared 430 kms off the coast.
Britain and countries in the region have offered assistance. The US Navy is flying deep water rescue modules to Argentina to be deployed if the submarine is found on the sea floor.